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Adds some notes-to-self on SCSI and a route to using Acorn's ADFS.

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This commit is contained in:
Thomas Harte 2021-01-31 13:12:59 -05:00
parent 8142487d57
commit 8db289e229
5 changed files with 58 additions and 16 deletions
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14
Analyser/Static/Acorn/StaticAnalyser.cpp
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@ -61,10 +61,6 @@ static std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>>
Analyser::Static::TargetList Analyser::Static::Acorn::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
auto target = std::make_unique<Target>();
target->confidence = 0.5; // TODO: a proper estimation
target->has_dfs = false;
target->has_adfs = false;
target->should_shift_restart = false;
// strip out inappropriate cartridges
target->media.cartridges = AcornCartridgesFrom(media.cartridges);
@ -111,9 +107,10 @@ Analyser::Static::TargetList Analyser::Static::Acorn::GetTargets(const Media &me
if(dfs_catalogue == nullptr) adfs_catalogue = GetADFSCatalogue(disk);
if(dfs_catalogue || adfs_catalogue) {
// Accept the disk and determine whether DFS or ADFS ROMs are implied.
// Use the Pres ADFS if using an ADFS, as it leaves Page at &EOO.
target->media.disks = media.disks;
target->has_dfs = bool(dfs_catalogue);
target->has_adfs = bool(adfs_catalogue);
target->has_pres_adfs = bool(adfs_catalogue);
// Check whether a simple shift+break will do for loading this disk.
Catalogue::BootOption bootOption = (dfs_catalogue ?: adfs_catalogue)->bootOption;
@ -144,6 +141,13 @@ Analyser::Static::TargetList Analyser::Static::Acorn::GetTargets(const Media &me
}
}
// Enable the Acorn ADFS if a mass-storage device is attached;
// unlike the Pres ADFS it retains SCSI logic.
if(!media.mass_storage_devices.empty()) {
target->has_pres_adfs = false;
target->has_acorn_adfs = true;
}
TargetList targets;
if(!target->media.empty()) {
targets.push_back(std::move(target));

6
Analyser/Static/Acorn/Target.hpp
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@ -18,7 +18,8 @@ namespace Static {
namespace Acorn {
struct Target: public ::Analyser::Static::Target, public Reflection::StructImpl<Target> {
bool has_adfs = false;
bool has_acorn_adfs = false;
bool has_pres_adfs = false;
bool has_dfs = false;
bool has_ap6_rom = false;
bool has_sideways_ram = false;
@ -27,7 +28,8 @@ struct Target: public ::Analyser::Static::Target, public Reflection::StructImpl<
Target() : Analyser::Static::Target(Machine::Electron) {
if(needs_declare()) {
DeclareField(has_adfs);
DeclareField(has_pres_adfs);
DeclareField(has_acorn_adfs);
DeclareField(has_dfs);
DeclareField(has_ap6_rom);
DeclareField(has_sideways_ram);

49
Machines/Electron/Electron.cpp
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@ -64,10 +64,15 @@ class ConcreteMachine:
{machine_name, "the Acorn BASIC II ROM", "basic.rom", 16*1024, 0x79434781},
{machine_name, "the Electron MOS ROM", "os.rom", 16*1024, 0xbf63fb1f}
};
if(target.has_adfs) {
const size_t pres_adfs_rom_position = required_roms.size();
if(target.has_pres_adfs) {
required_roms.emplace_back(machine_name, "the E00 ADFS ROM, first slot", "ADFS-E00_1.rom", 16*1024, 0x51523993);
required_roms.emplace_back(machine_name, "the E00 ADFS ROM, second slot", "ADFS-E00_2.rom", 16*1024, 0x8d17de0e);
}
const size_t acorn_adfs_rom_position = required_roms.size();
if(target.has_acorn_adfs) {
required_roms.emplace_back(machine_name, "the Acorn ADFS ROM", "adfs.rom", 16*1024, 0x3289bdc6);
}
const size_t dfs_rom_position = required_roms.size();
if(target.has_dfs) {
required_roms.emplace_back(machine_name, "the 1770 DFS ROM", "DFS-1770-2.20.rom", 16*1024, 0xf3dc9bc5);
@ -91,19 +96,23 @@ class ConcreteMachine:
* the keyboard and BASIC ROMs occupy slots 8, 9, 10 and 11;
* the DFS, if in use, occupies slot 1;
* the ADFS, if in use, occupies slots 4 and 5;
* the Pres ADFS, if in use, occupies slots 4 and 5;
* the Acorn ADFS, if in use, occupies slot 6;
* the AP6, if in use, occupies slot 15; and
* if sideways RAM was asked for, all otherwise unused slots are populated with sideways RAM.
*/
if(target.has_dfs || target.has_adfs) {
if(target.has_dfs || target.has_acorn_adfs || target.has_pres_adfs) {
plus3_ = std::make_unique<Plus3>();
if(target.has_dfs) {
set_rom(ROM::Slot0, *roms[dfs_rom_position], true);
}
if(target.has_adfs) {
set_rom(ROM::Slot4, *roms[2], true);
set_rom(ROM::Slot5, *roms[3], true);
if(target.has_pres_adfs) {
set_rom(ROM::Slot4, *roms[pres_adfs_rom_position], true);
set_rom(ROM::Slot5, *roms[pres_adfs_rom_position+1], true);
}
if(target.has_acorn_adfs) {
set_rom(ROM::Slot6, *roms[acorn_adfs_rom_position], true);
}
}
@ -298,6 +307,7 @@ class ConcreteMachine:
break;
case 0xfc04: case 0xfc05: case 0xfc06: case 0xfc07:
printf("%04x %s %02x\n", address, isReadOperation(operation) ? "->" : "<-", *value);
if(plus3_ && (address&0x00f0) == 0x00c0) {
if(is_holding_shift_ && address == 0xfcc4) {
is_holding_shift_ = false;
@ -310,12 +320,39 @@ class ConcreteMachine:
}
break;
case 0xfc00:
printf("%04x %s %02x\n", address, isReadOperation(operation) ? "->" : "<-", *value);
if(plus3_ && (address&0x00f0) == 0x00c0) {
if(!isReadOperation(operation)) {
plus3_->set_control_register(*value);
} else *value = 1;
}
break;
case 0xfc03:
printf("%04x %s %02x\n", address, isReadOperation(operation) ? "->" : "<-", *value);
break;
// SCSI locations:
//
// fc40: data, read and write
// fc41: status read
// fc42: select write
// fc43: interrupt latch
//
// Status byte is:
//
// b7: SCSI C/D
// b6: SCSI I/O
// b5: SCSI REQ
// b4: interrupt flag
// b3: 0
// b2: 0
// b1: SCSI BSY
// b0: SCSI MSG
//
// Interrupt latch is:
//
// b0: enable or disable IRQ on REQ
// (and, possibly, writing to the latch acknowledges?)
default:
if(address >= 0xc000) {

2
OSBindings/Mac/Clock Signal/Machine/StaticAnalyser/CSStaticAnalyser.mm
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@ -99,7 +99,7 @@
using Target = Analyser::Static::Acorn::Target;
auto target = std::make_unique<Target>();
target->has_dfs = dfs;
target->has_adfs = adfs;
target->has_pres_adfs = adfs;
target->has_ap6_rom = ap6;
target->has_sideways_ram = sidewaysRAM;
_targets.push_back(std::move(target));

3
ROMImages/Electron/readme.txt
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@ -8,10 +8,9 @@ DFS-1770-2.20.rom — used only if the user opens a DFS disk image
ADFS-E00_1.rom — used only if the user opens an ADFS disk image
ADFS-E00_2.rom
AP6v133.rom — used only if the user opens a disk image that makes use of any of the commands given below.
adfs.rom - used only if the user opens a hard disk image
Possibly to be desired in the future:
* adfs.rom
* ElectronExpansionRomPresAP2-v1.23.rom
* os300.rom
Commands that trigger a request for the AP6v133 ROM: